Dr. Robert S. Wallerstein discusses, among other topics, the different models of psychoanalysis and the dynamic psychotherapies; the crystallization of consensus on these concepts in the post-World War II period and the progressive fragmentation in subsequent decades; and the relation of these evolving trends both to the proliferating relational and interactional perspectives in today`s psychoanalytic world and to the increasing acknowledgment and accptance of four worldwide psychoanalytic theoretical diversity.